Resistencia al desalojo por empuje de materiales restaurativos directos

Abstract

Purpose: The aim of this research is to evaluate, by means of the push out method, the bond strength of direct filling materials, in filling at the dentin. Methods: Fifty caries-free bicuspids were extracted for orthodontic or surgical reasons; samples were divided into five groups of 10 samples. One type of each material namely amalgam, composite resin, compomer, auto-cured glass ionomer and resin modified glass ionomer were used in a push test to dislodge them from the dentin disk using a Universal Testing Machine Instron and the force calculated in MPa. The samples recovered after push out were observed and photographed on their contact surfaces with an optical microscope. Results: A statistic significant difference between auto-cured glass ionomer and resin-modified ionomer in comparison with the rest of the materials. Images of the surfaces after push out show shapes of dentin prepared with diamond wheels and particular characteristics of the bond surfaces in every material evaluated. Conclusions: This leaded us that auto-cured glass ionomer and, above all, resin Modified glass ionomer are the best alternative for direct filling for teeth non support occlusion stress.